Turbulent dynamics in rotating helium superfluids

Details Turbulent dynamics in rotating helium superfluids Turbulent dynamics in rotating helium superfluids

2008-03-23

arxiv.org/abs/0803.3225v2

Progress in Low Temperature Physics, Vol. XVI, 45-146 (2009)

Physics

Condensed Matter

Other Condensed Matter

100 pages 47 figures. Submitted for publication in Progress in Low Temperature Physics, Vol. XVI

Scientific paper

10.1016/s0079-6417(08)00002-4

New techniques, both for generating and detecting turbulence in the helium superfluids 3He-B and 4He, have recently given insight in how turbulence is started, what the dissipation mechanisms are, and how turbulence decays when it appears as a transient state or when externally applied turbulent pumping is switched off. Important simplifications are obtained by using 3He-B as working fluid, where the highly viscous normal component is practically always in a state of laminar flow, or by cooling 4He to low temperatures where the normal fraction becomes vanishingly small. We describe recent studies from the low temperature regime, where mutual friction becomes small or practically vanishes. This allows us to elucidate the mechanisms at work in quantum turbulence on approaching the zero temperature limit.

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